KristinaM, yes you are right, I really wanted to talk to someone but not able to in rl. I'm leaving it with my dh to decide what to do next.It's taking a while to sink in and he has said that it has shaken the whole foundation of his life. He spoke a bit about it today but it's really not as simple as it might seem to some people and there are bound to be serious repercussions when and if the rest of the family know. He does have siblings, one with a serious mental health problem, who would find the news very difficult to cope with and another who would also be extremely upset. In fact my dh is the person most able to cope with this news.
I have asked advice from a social worker in the adoption department of social services. She has said that it is important that my dh is pressurised to do anything he doesn't want to and to be very careful if we decide to meet this person as we don't really know his background and although it may go very well, he may have all sorts of unresolved issues and demands including anger and mental health issues. Also that at the time he was adopted there would have been no records kept about the circumstances of the adoption unless he was conceived as a result of incest or rape, in which case there may be police reports on file.
There is really very little to go on at the moment (when I said in my previous post the my dh's mother had some small fame, this was nothing to do with what was on the adoption certificate, so he would not have connected it at all to the occupation listed). What I meant was that if he had googled her name he would have found a news item about her.
In the last email correspondence I had with the person he said he would employ a specialist researcher to see if he could find a definite link between himself and my dh's mother and that he would contact me in a few weeks time with whatever had been found - so we are going to leave it there.
I know some of the mumsnetters here are not very sympathetic to my dh's reaction, and have 'taken sides' with the adopted person. I wasn't asking anyone to take sides and maybe this is the wrong forum to unburden myself to.